I had a centre baffle crack because of insufficient bracing (the tank makers mistake, not mine!), then that stressed a corner seam and it started leaking, and now I'm certain that how I've designed the mechanical filtration isn't going to work as the wool etc will be too restrictive. Could use a big canister as mechanical to bypass that stage, but that will also be more money. Kind of ignoring it for now, the whole thing is a bit depressing really, scared that if I fill it up and it leaks for a third time I'll drown myself in it....
I'll be interested to see how the settling bit works. Only flaw I can see is that all the media is underwater, ideally a mix of wet and "dry" media would be best, will still work though. And the baffles between the heaters and pump don't really seem necessary, other than that it looks good.